Inspired by https://dev.to/hankchizljaw/a-modern-css-reset-6p3

modern-reset.css

:root {
  font-size: 16px;

  --font-smaller: 12px;
  --font-small: 14px;
  --font-normal: 16px;
  --font-big: 18px;
  --font-bigger: 24px;
  --font-bigest: 33px;

  --border-radius: 4px;
  --border-color: #e7eaf0;

  --icon-size-small: 12px;
  --icon-size-normal: 16px;
  --icon-size-big: 24px;

  --gap-tiny: 4px;
  --gap: 15px;
  --gap-negative: -15px;
  --gap-half: 7.5px;
  --gap-half-negative: -7.5px;
  --gap-double: 30px;
  --gap-double-negative: -30px;

  --transition-speed-fast: 200ms;
  --transition-speed-normal: 300ms;
  --transition-speed-slow: 400ms;
  --transition-speed-very-slow: 500ms;

  --color-red: #F31431;
  --color-green: #4BB543;

  --box-shadow: 0px 4px 8px rgba(0, 0, 0, 0.1);
  --box-shadow-light: 0px 1px 4px rgba(0, 0, 0, 0.05);
}

html {
  scroll-behavior: smooth;
  box-sizing: border-box;
}

/* Box sizing rules */
*,
*::before,
*::after {
  box-sizing: inherit;
}

/* Remove default padding */
*{
  padding: 0;
  margin: 0;
}

/* Set core body defaults */
body {
  min-height: 100vh;
  text-rendering: optimizeSpeed;
  line-height: 1.5;
  
  font-size: var(--font-normal);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  
  padding: var(--gap);
}

/* Remove list styles on ul, ol elements with a class attribute */
ul, ol {
  list-style: none;
}

/* Make images easier to work with */
img {
  max-width: 100%;
  margin: 0 auto;
  display: block;
}

/* Make video fluid. The aspect ratio of the video is maintained */
video {
  width: 100%    !important;
  height: auto   !important;
}

/* Natural flow and rhythm in articles by default */
article > * + * {
  margin-top: 1rem;
}

/* Inherit fonts for inputs and buttons */
input,
button,
textarea,
select,
table {
  font: inherit;
  color: inherit;
}

a > *,
button > * {
  pointer-events: none;
}

/* Remove _all_ animations and transitions for people that prefer not to see them */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-play-state: paused !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}